I have the same problem. I notice that the clock consistently updates a moment or two after I wake the phone up. The time difference is sometimes a minute or two, sometimes half an hour or more, sometimes an hour or two (depending on how long the phone's been asleep).
I have the HTC 6 tab home plug installed as well as A_C's slide2lock. Both of those programs display a lagging clock when first woken up, which then updates a moment or two later to the correct time. The fact that two separate programs exhibit this behavior leads me to believe that it's the OS's fault.
This is a minor annoyance in and of itself, but when coupled with the phone's wonky alarm clock, this becomes a much larger problem. I have a hunch the two issues are related. Until I found the workaround (plug the phone in to AC outlet, disable "turn off device..." on external power setting), this phone was unusable as an alarm clock. In the morning, the alarm would not go off until I woke up the phone and the time updated itself.
I have a further hunch that this non-updating time thing is the cause of the alarm clock bug. (Any more hunches and they'll stick me in a bell tower...)
I don't have a fix for this while on battery. The workaround I've found to make the phone usable as an alarm clock is to keep it plugged in overnight and disable the "turn off device while on external power" setting. I'd rather find a better fix for this than leaving the thing on overnight.
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